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Javier Waitzel, Objective-C Developer in Buenos Aires, Argentina
Javier Waitzel

Objective-C Developer in Buenos Aires, Argentina

Member since February 24, 2014
Javier is a top engineer and entrepreneur who is passionate about new technologies and software development. He has experience in mobile application design and development, and he's worked extensively with multidisciplinary teams bringing innovative ideas to every project.
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Portfolio

Experience

  • Objective-C, 4 years
  • iOS, 4 years
  • Xcode, 4 years
  • iOS SDK, 4 years
  • C#, 1 year
  • Unity, 1 year
Buenos Aires, Argentina

Availability

Full-time

Preferred Environment

Xcode, Objective-C, iOS, OS X, Unity, C#, Git

The most amazing...

...thing i've built is an Arduino-server iOS project to unlock doors when in close proximity that works smoothly.

Employment

  • Co-Founder, Developer

    2010 - PRESENT
    Esqulilax Games
    • Migrated an Objective-C project to Unity.
    • Created an OpenGL-based graphics engine supporting 2D and 3D rendering.
    • Designed a custom level creation tool for the app "Climber Brothers".
    • Developed several iOS Games (”Climber Brothers”, “Battle Rush”, “Chinchon”, “Escoba de 15”).
    • Integrated a physics engine (Box2D) using C++.
    • Created a .OBJ (3D models) loader and parser for rendering 3D meshes.
    • Developed the AI for card games featuring a variable level of skill.
    • Added support for sharing content on social networks in all of the company's games.
    • Incorporated SVG support for curve creation and terrain design.
    • Created a smoothing algorithm using SVG curves and approximation.
    • Designed and implemented a PVP (Player vs Player) multiplayer environment for a battle game.
    • Developed a server-client framework for displaying animations simultaneously on different devices.
    Technologies: iOS, OS X, OpenGL-ES, Objective-C, Unity, C#

  • iOS Engineer

    2015 - 2015
    PocketGM (via Toptal)
    • Created an iOS app to manage all your fantasy teams from different providers in once place.
    • Supported login using different 3rd party services (Facebook, Twiter, Google).
    • Implemented views with code using Masonry (AutoLayout framework) supporting all iPhone screen sizes.
    • Collaborated with the design team and created some reusable views to make a consistent UI.
    • Supported continuous integration, code coverage, crash reports, and analytics frameworks.
    Technologies: Swift, Objective-C, iOS, Facebook SDK

  • iOS Engineer

    2015 - 2015
    Ceevoo (via Toptal)
    • Built an app for discovering nearby users using iBeacons (BLE).
    • Enhanced "Universal" app experience for iOS using Size Classes.
    • Used Core Bluetooth and Core Location simultaneously for advertising and discovering users.
    • Implemented Parse integration with a local data store and push notifications.
    • Created a framework for discovering users even if the app is closed.
    Technologies: Swift, Parse, Bluetooth Low Energy

  • iOS Engineer

    2014 - 2014
    uSuit (via Toptal)
    • Created a 3D High-Poly model viewer app for iOS (Universal).
    • Implemented Dropbox integration.
    • Implemented SceneKit and UIKit integration.
    • Implemented mesh customization in real-time.
    • Created synchronized local storage for offline use.
    Technologies: Swift, Objective-C, SQLite

  • iOS Engineer

    2014 - 2014
    reTXT (via Toptal)
    • Created a text messaging iOS app. Worked with a team of 3 iOS developers.
    • Implemented Apache Thrift integration.
    • Built a custom SQLite local database.
    • Implemented multimedia messages.
    • Achieved complex animations using Core Animation and Auto Layout.
    • Built an API basis to use in all mobile clients.
    Technologies: iOS, Objective-C, SQLite, Thrift, Core Animation

  • Software Engineer

    2013 - 2013
    iKey SRL
    • Developed an iOS and iPad app for final users and admins.
    • Developed the Arduino software for interacting with the iOS app and the server.
    • Created and deployed the hardware solution for the project using Arduino.
    • Integrated two incompatible Arduino shells using a master-slave model.
    • Developed several functionalities in the back-end using PHP and SQL.
    • Integrated Bluetooth low-energy allowing proximity opening for doors.
    • Developed an offline solution and an on-demand synchronization with the server.
    Technologies: Arduino, PHP, Objective-C, SQL, Bluetooth Low Energy

  • iOS Developer

    2012 - 2012
    Oxean
    • Developed the app, "Vale Puerto", for showing company port facilities in Argentina.
    • Created the app, "Vale", for displaying company facilities in Argentina.
    • Supported image and video display via AVFoundation.
    • Designed a custom map interface showing different spots in the VALE facilities.
    • Designed a plist-based file for storing and loading map points and information.
    • Implemented support for efficient scrolling around the "Vale" app.
    Technologies: iOS, Objective-C

  • iOS Developer

    2012 - 2012
    Portegno Apps
    • Created the "Crazy Hairstyle Studio" app.
    • Developed a base framework for editing hairstyles in a realistic hairstyle salon app.
    • Added features for camera support, photo editing, and screenshot export to a game.
    • Created a Photoshop script for exporting hairstyles and loading them into the app.
    • Integrated OpenGL and UIView successfully improving general performance.
    • Added support for real-time image editing by rendering images to textures.
    • Created an anchor and multi-point manipulation system for displayed objects.
    • Built a multi-shading tool for blurring, coloring, and efficient rendering of images.
    Technologies: iOS, OpenGL-ES, Objective-C, XML

  • iOS Developer

    2011 - 2012
    Webetico SNC
    • Created a CRM app allowing customers to place orders online and offline.
    • Created a multi-language app for a museum displaying information about museum exhibits.
    • Integrated image synchronization on demand.
    • Developed a framework for synchronizing local data with server data.
    • Designed and implemented a custom grid for displaying data.
    • Supported communication with an AS400 for an iOS app.
    • Supported multithreaded loading of images to display in a catalogue.
    • Created a trivia game that allowed prospective customers to enter their contact information.
    Technologies: Objective-C, iOS, SQL

Experience

  • Climber Brothers (Development)

    An iOS rope physics puzzle game with 4.5/5 stars review.
    Free version: https://itunes.apple.com/us/app/climber-brothers-lite/id452800570?l=es&ls=1&mt=8

  • Battle Rush (Development)
    https://itunes.apple.com/us/app/battle-rush/id662898453?mt=8

    An infinite multiplayer PVP runner game.

  • Crazy Hair Studio (Development)

    A realistic hairstyle simulator.

  • Chinchon (Development)

    A Spanish card game for iOS.

  • Escoba de 15 (Development)

    A Spanish card game with single and multiplayer features.

  • iJewels (Development)

    A jewelry catalogue iPad application for Cielo Venezia.

  • Award for Esquilax Games (Other amazing things)

    Our company was choosen from 200 indie game companies around the world for the program Chartboost University: Boot Camp and for the GDC (Game Developers Conference).

Skills

  • Languages

    Objective-C, C++, C#, PHP, C, SQL

  • Frameworks

    AFNetworking, iOS SDK, ZURB Foundation, Cocoa, Cocoa Touch, Unity, Unity3D, Core Location, Core Bluetooth

  • Libraries/APIs

    Parse SDK, Flurry, Facebook iOS SDK, AdColony, Dropbox API, Twitter iOS SDK, SBJson

  • Tools

    Adobe Photoshop, TestFlight, Xcode, Git, 3ds Max, Adobe Illustrator, Cinema 4D, Visual Studio, MAMP

  • Paradigms

    Object-oriented Programming (OOP), Agile Software Development, XP, Model View Controller (MVC), Continuous Integration (CI)

  • Platforms

    MapBox, Arduino, Mac OS, iOS, Windows

  • Storage

    SQLite, MySQL

  • Other

    User Interface (UI), Game Design

Education

  • Bachelor's degree in Software Engineering
    2009 - 2013
    Universidad Tecnológica Nacional - Buenos Aires, Argentina
Hire the top 3% of freelance developers
toptal.com
Call us: +1.888.604.3188
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